README: draw the signal path as SVG diagrams

Replace the ASCII signal chain in both READMEs with a rendered diagram
(resources/diagram_en.svg / resources/diagram_ru.svg): SIM card <-> reader
with the passive tap on the contacts, the FX2 logic analyzer, sigrok-cli
with the iso7816 decoder, GSMTAP UDP :4729, and the SIMtrace Analyser /
Wireshark consumers.

The SVGs are hand-authored, self-contained (no scripts, no external
references), carry <title>/<desc>, and each README embeds its own language
variant with the chain repeated in the alt text.

Release packaging: both diagrams are added to the archive allowlist.  The
shared-image equality check ignores them (the READMEs embed different
files by design), while every other resources/ photo must still match
across the two READMEs.  AGENTS.md documents the exception.

AGENTS.md

@@ -1033,11 +1033,13 @@ pathspec, and also compared exactly against both archive listings (missing
 *and* unexpected entries fail): the decoder (`__init__.py`, `pd.py`,
 `gsmtap_stream.py`), the scripts (`setup.sh`/`start.sh`,
 `setup.bat`/`start.bat`), `tools/vs_reader.py`, `README.md`, `README_RUS.md`,
-`LICENSE`, and every `resources/` image referenced from `README.md`.  Tests,
-`AGENTS.md`, the CI config, the development tools and the unreferenced
-`resources/` images never enter the release.  No `export-ignore` rules are
-used, so GitHub's own source archives still contain the full tree.  `dist/`
-is gitignored.
+`LICENSE`, every `resources/` photo referenced from both READMEs, and the two
+language variants of the pipeline diagram (`resources/diagram_en.svg`,
+`resources/diagram_ru.svg`, added explicitly because each README embeds its
+own).  Tests, `AGENTS.md`, the CI config, the development tools and the
+unreferenced `resources/` images never enter the release.  No `export-ignore`
+rules are used, so GitHub's own source archives still contain the full tree.
+`dist/` is gitignored.
 
 Both archives are unpacked and verified: `pd.py` VERSION, `py_compile` of the
 three modules, `bash -n` of the shell scripts, the tar exec bits, CRLF on the